You'd expect touch-gesture zoom to still work under pixel scaling though. You'd expect to just see a downsampled image up close, plus normal-looking text up close, right?
Here even the text doesn't zoom.
Here even the text doesn't zoom.
It does also prevent accidental zooms when users intend to scroll, so maybe that's a use? Often times the meta viewport tag (which is quite arcane) is just copy-pasted without deep knowledge of what it does.